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If you disconnect thermostat wires and heat continues to run it is the sequencer sticking. If this continues, try a different brand of sequencer.Ask for a U>S> mad sequencer.
Most likely a sticking sequencer. Do you see China or Mexico stamped on sequencer.
I would try to find a set of US made sequencers and try that
Just rate when ready. Emerson used to all be made here. I usually ask supplier to make sure. Let me know how it goes.
Wow, that would do it.Thanks for the update